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Relay detection circuit suitable for photovoltaic inverter and detection method of relay detection circuit

A photovoltaic inverter and detection circuit technology, which is applied in circuit breaker testing, instrumentation, measuring electricity, etc., can solve the problem of not being able to detect a single relay sticking or disconnection

Active Publication Date: 2021-06-18
苏州海鹏科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] When the current photovoltaic inverter controls two relays at the same time for two drives, it can only judge whether the two relays of one drive are stuck or disconnected, but it cannot detect whether a single relay is stuck or disconnected.

Method used

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  • Relay detection circuit suitable for photovoltaic inverter and detection method of relay detection circuit

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Embodiment Construction

[0012] In order to make the above objects, features and advantages of the present invention more comprehensible, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0013] The term "one embodiment" or "embodiment" here refers to that specific features, structures or characteristics related to the embodiment can be included in at least one implementation of the present invention. The appearances of "in one embodiment" in various places in this specification do not necessarily all refer to the same embodiment, nor do they necessarily refer to a separate or selected embodiment that is mutually exclusive of other embodiments. "Multiple" and "several" in the present invention mean two or more. "And / or" in the present invention means "and" or "or".

[0014] Please refer to figure 1 As shown, it is a schematic circuit diagram of a relay detection circuit suitable for a photovoltaic inverter in an ...

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Abstract

The invention discloses a relay detection circuit suitable for a photovoltaic inverter and a detection method of the relay detection circuit. The relay detection circuit comprises an H-bridge circuit, a first relay S1, a second relay S2, a third relay S3, a fourth relay S4, a voltage division circuit, wherein a first resistor R1 of the voltage division circuit is connected between a first node E and a second node F, a second resistor R2 and a third resistor R3 are sequentially connected between the second node F and the grounding end in series, and the output voltage of the voltage division circuit is the voltage drop of the third resistor R3, a driving circuit which is used for controlling the relays S1 and S3 to be switched on or switched off at the same time, controlling the relays S2 and S4 to be switched on or switched off at the same time, and controlling each switching tube in the H-bridge circuit to be switched on or switched off, and a detection circuit which is used for judging whether any one of the first relay S1, the second relay S2, the third relay S3 and the fourth relay S4 is stuck or disconnected. Compared with the prior art, when two relays are simultaneously controlled by two paths of driving, whether a single relay is damaged or not can be accurately detected.

Description

【Technical field】 [0001] The invention relates to the field of relay detection of inverters, in particular to a relay detection circuit suitable for photovoltaic inverters and a detection method thereof. 【Background technique】 [0002] Photovoltaic inverter (PV inverter or solar inverter) can convert the variable DC voltage generated by photovoltaic (PV) solar panels into an inverter of mains frequency alternating current (AC), which can be fed back to the commercial transmission system, or for off-grid Grid usage of the grid. Photovoltaic inverter is one of the important balance of system (BOS) in photovoltaic array system, which can be used with general AC power supply equipment. [0003] When the current photovoltaic inverter controls two relays at the same time for two drives, it can only judge whether the two relays of one drive are stuck or disconnected, but cannot detect whether a single relay is stuck or disconnected. [0004] Therefore, it is necessary to provide ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/327
CPCG01R31/3278Y02E10/56
Inventor 涂鹏飞
Owner 苏州海鹏科技有限公司
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